Irradiation assembly for liquid purification assembly, purification assembly and beverage dispenser

A method for purifying a liquid comprising:

• providing a liquid purification assembly using ultraviolet light irradiation against reproduction of pathogenic microorganisms, comprising an irradiation chamber having an internal volume and comprising an inlet and an outlet, the irradiation chamber being provided with an ultraviolet light emitting member configured to irradiate liquid in the irradiation chamber with ultraviolet light,
• the irradiation chamber comprises a mechanism configured to cause a change in the internal volume of the irradiation chamber, the change in internal volume drawing liquid into the irradiation chamber when the volume of the irradiation chamber increases, and forcing liquid out of the irradiation chamber when the volume of the irradiation chamber decreases, in which the irradiation chamber is at a minimal volume;
• increasing the volume of the irradiation chamber, thereby causing a decrease in pressure which draws liquid into the irradiation chamber through the inlet;
• irradiating the liquid contained in the irradiation chamber using the ultraviolet light emitting member, thereby purifying the liquid contained in the irradiation chamber;
• and
• decreasing the volume of the irradiation chamber, thereby forcing purified liquid out of the irradiation chamber.